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The magnet pairs (n is an even number) are arranged and assembled on the inner and outer magnetic rotors of the magnetic actuator according to the law, so that the magnet parts are mutually formed into a fully coupled magnetic force system.The magnetic energy of the magnetic system is the lowest when the internal and external magnetic poles are opposite, i.e., the displacement angle Φ and 0 between the two magnetic poles, and the maximum is when the magnetic pole is rotated to the same pole, i.e., the displacement angle Φ and 2 π / n between the two magnetic poles.After removing the external force, because the magnetic poles of the magnetic system repel each other, the magnetic force will restore the magnet to the state of the lowest magnetic energy.The magnet then generates motion, which drives the magnetic rotor to rotate.
B.Selection step.
The status of magnetic pump production and magnetic materials, sliding bearing development, in order to ensure the quality of the project, in the selection of magnetic pump can refer to the following steps.
1. When the power of the pump is less than 10KW, select the magnetic pump to ensure the effect.
2. When the axial power of the pump is greater than 10KW or the medium temperature is higher than 100C, the domestic magnetic pump should be treated carefully, the material of magnetic steel and the structure of bearing material should be limited, and the shielded pump should be selected if necessary.
3. At present, the domestic magnetic pump manufacturers are generally medium and small factories, the development and research means are relatively weak.Generally speaking, it is not suitable to entrust the manufacturer to research or develop the pumps beyond the parameters of the products in order to ensure the quality and progress of the project.The main domestic magnetic pump manufacturers and their products are listed in Table 1-1.
4. The quality of magnetic steel material is related to the service life, reliability and price of the pump. When ordering, the magnetic steel material, the supplier and its performance index should be made clear.The material and life of the sliding bearing should also be defined.
Operation cautions.
1. Preventing particles from entering.
(1) ferromagnetic impurities and particles shall not be allowed to enter the magnetic drive and bearing friction pair.
(2) after conveying the medium which is easy to crystallize or precipitate, flush in time (pour water into the pump cavity after stopping the pump, discharge clean after running 1min), the common problems about the fire pump in our country, in order to guarantee the service life of the sliding bearing.
(3) when conveying the medium containing solid particles, it should be filtered at the inlet of the flow pipe of the ZCQ type self-priming magnetic drive pump.
2. Prevention of demagnetization.
(1) the magnetic moment can not be designed to be too small.
(2) it should be operated under the specified temperature condition, and the medium temperature exceeding the standard is strictly prohibited.The platinum resistance temperature sensor can be installed on the outer surface of the magnetic pump isolating sleeve to detect the temperature rise in the annular gap region so as to give an alarm or stop the machine when the temperature exceeds the limit.
3. Prevention of dry friction.
(1) No idling is allowed.
(2) medium extraction is strictly prohibited.
(3) when the outlet valve is closed, the pump shall not operate continuously for more than 2 minutes in case the magnetic actuator overheats and fails.
C.Compared with centrifugal pumps with mechanical or packing seals, magnetic pumps have the following characteristics.
1. The shaft of the pump is changed from dynamic seal to closed static seal, and the leakage of medium is avoided completely.
2. Without independent lubrication and cooling water, the energy consumption is reduced.
3. From coupling drive to synchronous drive, there is no contact and friction.The utility model has the advantages of low power consumption, high efficiency, and the damping and damping effect, which reduces the influence of the motor vibration on the pump and the influence of the cavitation vibration on the motor when the pump is subjected to cavitation vibration.
4. When overloaded, the inner and outer magnetic rotors are relatively slippage, which can protect the motor and pump.
D.Application of magnetic pump.
Magnetic pumps are widely used in petroleum, chemical, pharmaceutical, electroplating, environmental protection, water treatment, film and television development, national defense and other departments to pump and deliver flammable, explosive, toxic and valuable liquids.It is an ideal pump for creating leak-free and pollution-free lamination workshop and lamination factory.
Related reading:Stainless Steel Magnetic Pump,Corrosion Resistant Stainless Steel Pump
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